Geodesic
On the problem of reducibility of systems of linear differential equations with quasiperiodic coefficients
Izvestiya. Mathematics , Tome 1 (1967) no. 2, pp. 335-340.

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It is shown herein that there are irreducible systems among those with quasiperiodic analytic coefficients whose frequencies are algebraic numbers. 
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I. N. Blinov. On the problem of reducibility of systems of linear differential equations with quasiperiodic coefficients. Izvestiya. Mathematics , Tome 1 (1967) no. 2, pp. 335-340. http://geodesic.mathdoc.fr/item/IM2_1967_1_2_a7/

[1] Arnold V. I., “Malye znamenateli i problemy ustoichivosti dvizheniya v klassicheskoi i nebesnoi mekhanike”, Uspekhi matem. nauk, 18:6(114) (1963), 91–196 | MR

[2] Erugin N. P., Privodimye sistemy, Tr. Matem. in-ta im. V. A. Steklova AN SSSR, 13, 1946 | MR | Zbl

[3] Levitan B. M., Pochti-periodicheskie funktsii, GITTL, M., 1953